Apache mod_rewrite compatibility

This version of ISAPI_Rewrite was designed to maintain maximum Apache mod_rewrite
compatibility. This objective was attained to at very high level, though some
features could not be implemented due to their high tie-up with Apache and UNIX
architecture and their implementation on IIS is senseless. For instance [H]
– “force content handler” flag cannot be implemented because
in IIS content handler is bounded to file extension. Or [NS] – “no
sub request” flag is meaningless because there are no sub requests in
IIS.
Here is a complete compatibility chart for ISAPI_Rewrite and mod_rewrite. Features
or directives marked in green are fully supported,
yellow features are partially supported or planned
for support in next minor version, and features marked in
red are unsupported.